Rules and Restrictions for Naming a UK Limited Company

Choosing a name for your limited company isn’t just a creative exercise—it’s a legal and regulatory minefield. Get it wrong, and you risk rejected applications, legal disputes, forced rebranding, or hefty fines. In this guide, you’ll find a detailed breakdown of every rule, restriction, and practical step you must follow to ensure your UK limited company name is unique, compliant, and fit for business. We cover legal requirements, trademark issues, sensitive words, Companies House rules, and actionable advice to help you get your company name right the first time.

When you set up a limited company in the UK, your company name must comply with a series of legal requirements. The rules are primarily set out in the Companies Act 2006 and enforced by Companies House, the official registrar of companies in England and Wales, Scotland, and Northern Ireland. The legal framework is designed to prevent confusion, deception, and abuse of sensitive or protected terms, and to protect both businesses and the public.

A company name is more than a label: it becomes a legal identity. Once registered, it appears on all official documents and must be displayed on your business premises, website, and correspondence. Breaching the rules can lead to your registration being refused, or even enforced name changes and penalties after incorporation. The law applies equally whether you’re a one-person startup or a rapidly growing SME.

The main body responsible for overseeing company names is Companies House. However, other agencies such as the Intellectual Property Office (IPO), the Financial Conduct Authority (FCA), and sector-specific regulators may also have a say—especially if your name touches on regulated activities or protected titles. That’s why it’s vital to do your homework before settling on a name.

Companies House maintains strict criteria for registering a company name. The most fundamental rule is that your chosen name must be unique—meaning it cannot be the 'same as' or 'too like' an existing company on the register. This isn’t just about identical spelling; it also covers names that sound very similar, use only minor punctuation or spacing differences, or which substitute certain terms (like 'UK' for 'Britain').

Companies House also prohibits names that are offensive, misleading, or likely to cause confusion with government bodies. Names cannot suggest a connection with the government, local authorities, or other public bodies unless you have explicit permission. You’re also restricted from using certain sensitive words or expressions (more on that below) without formal approval.

Beyond these headline rules, there are technical requirements: your name must end with 'Limited' or 'Ltd' (or their Welsh equivalents) unless you qualify for an exemption (rare for most for-profit companies). Non-compliance will result in your application being automatically rejected, often with little explanation beyond a standardised message.

• Must be unique—cannot be 'same as' or 'too like' an existing name
• Cannot be offensive or misleading
• Cannot suggest a connection with government or public authorities without permission
• Certain words/expressions require special approval
• Must end with 'Limited' or 'Ltd' (or 'Cyfyngedig'/'Cyf' in Welsh)

Many words and expressions are considered 'sensitive' because they imply a particular status, function, or connection. These words are listed in the Company, Limited Liability Partnership and Business Names (Sensitive Words and Expressions) Regulations 2014. Examples include 'British', 'International', 'Association', 'Bank', 'Charity', 'Group', 'Institute', 'Council', and many more. Using these without permission can land you in trouble—even if your intentions are innocent.

To use a sensitive word, you’ll typically need to provide evidence to Companies House showing you have the right, qualification, or permission to use it. This may involve written consent from a government department, regulator, or other relevant body. For instance, to use 'Bank' in your name, you’d need authorisation from the Prudential Regulation Authority and the FCA. For 'Charity', you’ll need to prove you are a registered charity.

The process is not just bureaucratic; it’s there to protect the public and prevent businesses from misleading consumers about their status or activities. If your application involves a sensitive word, expect additional scrutiny and delays—so plan accordingly. It’s worth checking the official list before you fall in love with a name that could be blocked.

• 'British', 'England', 'Scotland', 'Wales', 'Northern Ireland'—implying national status
• 'Royal', 'King', 'Queen', 'Prince', 'Princess'—requires permission from the Cabinet Office
• 'Charity', 'Trust', 'Foundation'—evidence of charitable status needed
• 'Bank', 'Insurance', 'Assurance', 'Fund'—regulated sectors need FCA/PRA approval
• 'Group', 'Holdings', 'International', 'Association'—must justify use

Just because Companies House accepts your company name doesn’t mean you’re legally in the clear. Company name registration is a separate process from trademark protection. It’s perfectly possible to register a company name that infringes someone else’s registered trademark—opening yourself up to legal action, forced rebranding, or costly settlements after incorporation.

The Intellectual Property Office (IPO) maintains the UK’s official trademark register. Before registering your company, search the IPO database for identical or similar trademarks in your sector. If you operate in a crowded market or use a generic term, extra caution is needed. Trademark owners can file objections or even force you to change your name after incorporation, especially if you use the name in branding and marketing.

If you plan to build a brand, protect your name with a trademark as soon as possible. Owning the name at Companies House gives you only limited legal rights, mainly preventing others from registering a company with the same or very similar name. It does not stop them from trading under it or registering it as a trademark. If in doubt, consult a trademark attorney or IP specialist before investing in branding or domain names.

• A Companies House registration does *not* equal trademark protection
• Always search the IPO trademark database before registering your company
• Consider trademarking your company/brand name for stronger protection
• Trademark disputes can force you to rebrand, even if Companies House accepted your name
• Be wary of names similar to major UK or international brands, even if spelled differently

Beyond legal and regulatory restrictions, your company name must also meet certain technical criteria. The name must be between 1 and 160 characters long (including spaces and punctuation), and only certain characters are allowed. Companies House will reject names that use symbols or characters not found on a standard UK keyboard, or that could be confused with others due to font or styling.

Acceptable characters include standard letters (A-Z, a-z), numbers (0-9), and a limited set of punctuation marks (such as commas, full stops, hyphens, apostrophes, and brackets). Special characters such as @, #, $, %, or emoji are not permitted. You also cannot use a name that consists only of punctuation or special characters, or that starts or ends with a space.

For most businesses, this isn’t an issue—but creative or tech-focused companies sometimes run into problems if they try to register names with unusual symbols. If your preferred name relies on a unique font or creative styling, remember that Companies House will ignore these for registration purposes. Stick to plain text for your application.

There are several important exceptions and special cases when it comes to naming rules. Charitable companies and community interest companies (CICs) may be allowed to omit 'Limited' or 'Ltd' from their name, provided they meet additional criteria and obtain approval from Companies House. If you’re registering a company in Wales, you can use 'Cyfyngedig' or 'Cyf' instead of 'Limited' or 'Ltd'.

Certain types of businesses—such as those in regulated sectors (banking, insurance, healthcare)—face additional restrictions and may need to seek approval from industry regulators before Companies House will accept a name. Names that imply a special status (like 'Royal' or 'Chartered') require permission from the relevant authority, such as the Cabinet Office or a chartered institute.

If your company is part of a larger group, or you’re setting up a subsidiary, you may be able to use a name that is 'same as' another in the group, but only if you meet strict conditions and provide supporting documentation. Always check the latest guidance on GOV.UK or consult a professional if you think your situation is unusual.

Before you get attached to a name, it’s crucial to check whether it’s available. Companies House offers a free online company name availability checker. This tool will quickly tell you if a name is already in use or too similar to an existing company. However, this is only a first step—because the system doesn’t check for trademark conflicts, domain name availability, or use by unregistered businesses.

For a thorough search, you should also check the IPO’s trademark register, look up domain name options, and search the web for businesses using the same or similar names. Remember, limited companies, sole traders, and partnerships aren’t all listed at Companies House, so a business could be trading under your chosen name without being incorporated. It’s also worth checking social media handles if you want a consistent brand presence.

Companies House does not allow you to 'reserve' a company name without actually incorporating the business. The only way to guarantee your chosen name is to register your company. If you’re not quite ready to launch, you can set up a dormant company to secure the name, but this comes with annual filing obligations, even if you’re not trading.

• Use the Companies House name checker for initial screening
• Search the IPO’s trademark register for existing trademarks
• Look up domain name and social media availability
• Check for unregistered businesses using the same name
• Consider registering a dormant company to secure the name

Naming your company is fraught with potential pitfalls. One of the most common mistakes is assuming that Companies House acceptance equals total legal security. In reality, you could be forced to change your name later if it infringes a trademark or is subject to a successful complaint by another company.

Another frequent issue is failing to check for sensitive words or not understanding the process for obtaining consent. Many applications are delayed or rejected because the required evidence or permissions are missing. Some founders also confuse trading names with company names, mistakenly thinking they can use any name for branding without regard to the official company name. This can backfire if your trading name is already protected as a trademark by another party.

Finally, rushing the name choice without checking domain, trademark, and social media availability can scupper your branding plans. It’s worth taking extra time at this stage to avoid expensive and disruptive changes down the line.

• Assuming Companies House approval equals trademark protection
• Overlooking sensitive words and failing to get consent
• Not checking domain or social handle availability
• Confusing trading names with registered company names
• Copying names that are 'too like' existing companies

If you breach company name rules, the consequences can be severe and disruptive. Companies House can reject your application outright, or—if an issue comes to light after incorporation—they can force you to change your name within a set period (usually 12 weeks). Failure to comply can lead to hefty fines and, in extreme cases, company dissolution.

If your name is 'too like' or 'same as' another on the register, the other company can lodge an objection. The Company Names Tribunal handles disputes where a name is registered in bad faith or to exploit another’s reputation. If a trademark owner believes your name infringes their rights, they can take you to court or use the tribunal process to force a change. These proceedings are time-consuming and expensive, usually requiring you to rebrand and update every aspect of your business.

It’s also worth noting that even if your name is accepted initially, objections can be raised months or even years later. That’s why it’s critical to get it right from the start—and to act quickly if you receive a notice or complaint.

Legal compliance is just the starting point for a successful company name. Your name is a core branding asset—it should be easy to spell, memorable, and work well online and offline. Avoid names that are hard to pronounce, easily misspelled, or too generic to stand out in your market. Think about the impression your name gives to customers, investors, and partners.

Consider how your name will look in logos, on letterheads, and as part of web addresses. Check how it translates if you plan to operate internationally—names with unintended meanings or negative connotations can cause embarrassment and lost business. It’s also wise to avoid names that limit your future growth (e.g., naming after a specific product or locality if you may diversify later).

Finally, always check that the .co.uk and .com domains are available, and try to secure relevant social media handles for consistency. If you can’t get an exact match, consider whether a different name might serve you better in the long run.

Many founders have similar questions when it comes to naming their UK limited company. Here are some of the most common, with clear answers based on current UK law and Companies House guidance.

Q: Can I use my own name in my company name? A: Yes, you can use your own name, but the usual rules apply—if your name is very common or matches an existing company, it may still be rejected.

Q: Can two companies have the same name if they’re in different industries? A: No. Companies House does not allow duplicate names, regardless of sector. Trademark law, however, is based on business class and sector, so two companies could theoretically use the same trademark in unrelated fields.

Q: Can I use a company name that’s also a domain name owned by someone else? A: Companies House doesn’t check domain names. However, you may face confusion, legal issues, or missed customers if there’s a mismatch.

Q: Can I change my company name later? A: Yes, but you must follow the formal procedure via Companies House and notify HMRC, banks, clients, and suppliers. It’s time-consuming and may require updating all legal documents.